ˈknock-up BrE AmE noun [countable] British English
the time before a tennis match officially starts when the players hit the ball to each other for practice ⇨ warm-up
ˈknock-up BrE AmE noun [countable] British English
the time before a tennis match officially starts when the players hit the ball to each other for practice ⇨ warm-up
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012